Function Reference

_WinAPI_CombineRgn

Combines two regions and stores the result in a third region

#include <WinAPIGdi.au3>
_WinAPI_CombineRgn ( $hRgnDest, $hRgnSrc1, $hRgnSrc2, $iCombineMode )

Parameters

$hRgnDest Handle to a new region with dimensions defined by combining two other regions. (This region must exist before CombineRgn is called.)
$hRgnSrc1 Handle to the first of two regions to be combined.
$hRgnSrc2 Handle to the second of two regions to be combined.
$iCombineMode Specifies a mode indicating how the two regions will be combined. This parameter can be one of the following values.
$RGN_AND - Creates the intersection of the two combined regions.
$RGN_COPY - Creates a copy of the region identified by $hRgnSrc1.
$RGN_DIFF - Combines the parts of $hRgnSrc1 that are not part of $hRgnSrc2.
$RGN_OR - Creates the union of two combined regions.
$RGN_XOR - Creates the union of two combined regions except for any overlapping areas.

Return Value

Success: Specifies the type of the resulting region. It can be one of the following values.
$NULLREGION - The region is empty.
$SIMPLEREGION - The region is a single rectangle.
$COMPLEXREGION - The region is more than a single rectangle.
Failure: 0 - No region is created.

Remarks

The two regions are combined according to the specified mode.
The three regions need not be distinct. For example, the $hRgnSrc1 parameter can equal the $hRgnDest parameter.

Related

_WinAPI_CreateRectRgn, _WinAPI_CreateRoundRectRgn, _WinAPI_GetWindowRgn, _WinAPI_SetWindowRgn

See Also

Search CombineRgn in MSDN Library.

Example

#include <GUIConstantsEx.au3>
#include <WinAPIGdi.au3>
#include <WinAPIHObj.au3>
#include <WinAPISys.au3>
#include <WindowsConstants.au3>

; get height of window title and width of window frame - may be different when XP theme is ON/OFF
Global $g_iHtit = _WinAPI_GetSystemMetrics($SM_CYCAPTION)
Global $g_iFrame = _WinAPI_GetSystemMetrics($SM_CXDLGFRAME)

Global $g_hGui = GUICreate("Test Windows regions", 350, 210)
Local $id_Default = GUICtrlCreateButton("Default region", 100, 30, 150)
Local $id_Round = GUICtrlCreateButton("Round region", 100, 60, 150)
Local $id_Buble = GUICtrlCreateButton("Buble region ", 100, 90, 150)
Local $id_Transparent = GUICtrlCreateButton("Transparent region", 100, 120, 150)
Local $id_Exit = GUICtrlCreateButton("Exit", 100, 150, 150)
GUISetState(@SW_SHOW)

Local $aPos = WinGetPos($g_hGui) ; get whole window size (no client size defined in GUICreate)
Global $g_iWidth = $aPos[2]
Global $g_iHeight = $aPos[3]

Local $iMsg, $hRgn
While 1
        $iMsg = GUIGetMsg()
        Select
                Case $iMsg = $GUI_EVENT_CLOSE Or $iMsg = $id_Exit
                        ExitLoop

                Case $iMsg = $id_Default
                        $hRgn = _WinAPI_CreateRectRgn(0, 0, $g_iWidth, $g_iHeight)
                        _WinAPI_SetWindowRgn($g_hGui, $hRgn)

                Case $iMsg = $id_Round
                        $hRgn = _WinAPI_CreateRoundRectRgn(0, 0, $g_iWidth, $g_iHeight, $g_iWidth / 3, $g_iHeight / 3)
                        _WinAPI_SetWindowRgn($g_hGui, $hRgn)

                Case $iMsg = $id_Buble
                        Local $hRgn1 = _WinAPI_CreateRoundRectRgn(0, 0, $g_iWidth / 2, $g_iHeight / 2, $g_iWidth / 2, $g_iHeight / 2) ; left-top
                        Local $hRgn2 = _WinAPI_CreateRoundRectRgn($g_iWidth / 2, 0, $g_iWidth, $g_iHeight / 2, $g_iWidth / 2, $g_iHeight / 2) ; right-top
                        _WinAPI_CombineRgn($hRgn1, $hRgn1, $hRgn2, $RGN_OR)
                        _WinAPI_DeleteObject($hRgn2)
                        $hRgn2 = _WinAPI_CreateRoundRectRgn(0, $g_iHeight / 2, $g_iWidth / 2, $g_iHeight, $g_iWidth / 2, $g_iHeight / 2) ; left-bottom
                        _WinAPI_CombineRgn($hRgn1, $hRgn1, $hRgn2, $RGN_OR)
                        _WinAPI_DeleteObject($hRgn2)
                        $hRgn2 = _WinAPI_CreateRoundRectRgn($g_iWidth / 2, $g_iHeight / 2, $g_iWidth, $g_iHeight, $g_iWidth / 2, $g_iHeight / 2) ; right-bottom
                        _WinAPI_CombineRgn($hRgn1, $hRgn1, $hRgn2, $RGN_OR)
                        _WinAPI_DeleteObject($hRgn2)
                        $hRgn2 = _WinAPI_CreateRoundRectRgn(10, 10, $g_iWidth - 10, $g_iHeight - 10, $g_iWidth, $g_iHeight) ; middle
                        _WinAPI_CombineRgn($hRgn1, $hRgn1, $hRgn2, $RGN_OR)
                        _WinAPI_DeleteObject($hRgn2)
                        _WinAPI_SetWindowRgn($g_hGui, $hRgn1)

                Case $iMsg = $id_Transparent
                        _GuiHole($g_hGui, 40, 40, 260, 170)

        EndSelect
WEnd

; make inner transparent area but add controls
Func _GuiHole($hWin, $iX, $iY, $iSizeW, $iSizeH)
        Local $hOuter_rgn, $hInner_rgn, $hCombined_rgn

        $hOuter_rgn = _WinAPI_CreateRectRgn(0, 0, $g_iWidth, $g_iHeight)
        $hInner_rgn = _WinAPI_CreateRectRgn($iX, $iY, $iX + $iSizeW, $iY + $iSizeH)
        $hCombined_rgn = _WinAPI_CreateRectRgn(0, 0, 0, 0)
        _WinAPI_CombineRgn($hCombined_rgn, $hOuter_rgn, $hInner_rgn, $RGN_DIFF)
        _WinAPI_DeleteObject($hOuter_rgn)
        _WinAPI_DeleteObject($hInner_rgn)
        _AddCtrlRegion($hCombined_rgn, $id_Default)
        _AddCtrlRegion($hCombined_rgn, $id_Round)
        _AddCtrlRegion($hCombined_rgn, $id_Buble)
        _AddCtrlRegion($hCombined_rgn, $id_Transparent)
        _AddCtrlRegion($hCombined_rgn, $id_Exit)
        _WinAPI_SetWindowRgn($hWin, $hCombined_rgn)
EndFunc   ;==>_GuiHole

; add control's area to given region
; respecting also window title/frame sizes
Func _AddCtrlRegion($hFull_rgn, $idCtrl)
        Local $aCtrl_pos, $hCtrl_rgn

        $aCtrl_pos = ControlGetPos($g_hGui, "", $idCtrl)
        $hCtrl_rgn = _WinAPI_CreateRectRgn($aCtrl_pos[0] + $g_iFrame, $aCtrl_pos[1] + $g_iHtit + $g_iFrame, _
                        $aCtrl_pos[0] + $aCtrl_pos[2] + $g_iFrame, $aCtrl_pos[1] + $aCtrl_pos[3] + $g_iHtit + $g_iFrame)
        _WinAPI_CombineRgn($hFull_rgn, $hFull_rgn, $hCtrl_rgn, $RGN_OR)
        _WinAPI_DeleteObject($hCtrl_rgn)
EndFunc   ;==>_AddCtrlRegion